Let's start with Naruto from Masashi Kishimoto.
Those who betray ninja rules are trash. But those who betray their comrades are worse than trash - Uchiha Obito.
Even the strongest of opponents always has a weakness - Uchiha Itachi.
If you don't share someone's pain. You can never understand them - Nagato.
A dropout will beat a genius through hard work - Rock Lee.
I am strong because I have people to protect - Uzumaki Naruto.
Because they saved me from myself, they rescued me from my loneliness. They were the first to accept me for who I am. They're my friends - Uzumaki Naruto.
Forget about revenge. The fate of those who seek revenge is grim. It's tragic, You will end up suffering and hurting yourself even more. Even if you do succeed in getting revenge, the only thing that remains is emptiness - Hatake Kakashi.
When people are protecting something truly precious to them. They truly can become. As strong as they need to be! - Haku.
b continued..